PROGRAMMING:5-4 finding the greatest common divisor of M and n

5-4 find the greatest common divisor of M and N, where m and N are input from the keyboard.
###Input format:
For example, enter two integers in a row, separated by spaces.
###Output format:
For example: output the greatest common divisor of M and n.
###Input example:
Here is a set of inputs. For example:
```in
6 9
```
###Output example:
The corresponding output is given here. For example:
```out
The greatest common divisor of 6 and 9 is 3
```







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